Well I can say that the geology part is definitely true.
There are some minerals where a quick way to differentiate between to similar looking ones is to lick it, and see what it tastes like. It;s quicker and easier than dragging samples back to a lab or running additional tests/measurements if it's already in a lab.
I remember how this meme was used to smugly tell Anti-SJWs off and tell them that they were a bunch of Nazi’s for disliking something, even when they tried pointing out the real reasons
Anyway
Who feels like adopting a hobo into a high class family?